Protractor

Front

What is a protractor?

Back

A protractor is a tool used to measure angles in degrees.

Front

What is the measurement of a right angle?

Back

90˚.

Front

What type of angle measures less than 90˚?

Back

Acute angle.

Front

What type of angle measures exactly 90˚?

Back

Right angle.

Front

What type of angle measures more than 90˚ but less than 180˚?

Back

Obtuse angle.

Front

What is the vertex of an angle?

Back

The vertex is the point where the two rays of the angle meet.

Front

What are rays in geometry?

Back

Rays are lines that start at a point and extend infinitely in one direction.

Front

How do you use a protractor to measure an angle?

Back

Align the midpoint of the protractor with the vertex of the angle and read the measurement where one ray crosses the protractor.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180˚.

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint, called the vertex.